Recently I saw Kai Po Che which is a movie based on the fiction novel 'Three Mistakes of my life' by Chetan Bhagat.
In the movie, Omi's parents get killed when a fire breaks out in a train coach in which they were travelling. Two conflicting political parties were shown - one led by Omi's uncle and another by some Muslim guy.
My guess is that Omi's uncle got his parents killed by having the train set on fire in order to provoke Omi (who didn't seem interested in politics) against the other party which later escalates into a Hindu-Muslim riot near the end.
Has it been explicitly stated (either in the film or any subsequent interviews) who it was that killed Omi's parents?